S3 awd system

[Joseph Pizzimenti]

I say this emphatically:

Haldex sucks next to Torsen.
The only good thing about it is that it allows you to
mount the engine more rear of the front axle, getting
rid of some oversteer, but on a TT, the Haldex could
use some work.

During the winter, this was obvious upon driving my
friend's TT 225.  Constant front to back shifts in the
snow and also on hard street driving.  One time when
he launched the car, he just spun the rears while the
fronts did nothing.

I'll take my torsens until something better comes...or
they bring back locking center diffs.  ;-)

Joe
--- Benjamin Weste Pearre
<bwpearre at alumni.princeton.edu> wrote:
> Please help!  Here's my current misunderstanding:
>
> Haldex: basically an improvement on the viscous
> coupling.  You have to
> break traction on some wheels before other wheels
> get more torque.
> Yes, it's only for a few milliseconds, but it still
> doesn't appeal to
> my aesthetic sensibilities ;)
>
> Torsen: you're 4wd by default---power is routed to
> all wheels, so you
> don't have to skid before those other wheels start
> helping.  In this
> way like a locked center diff, but slip is allowed
> if the torque ratio
> exceeds some threshold (4:1 or so) as it would when
> turning, using
> ABS, towing, etc?  I've seen diagrams and read
> explanations, but I'm
> not convinced that I grok it.  I think I'd need to
> play with one.
> What's the going rate for the diff out of a dead
> car?
>
> Aesthetic sensibilities aside, does anyone who's
> spent lots of snow or
> track time on both systems have any comments?  I've
> heard rumours that
> supposedly "unbiased" (whatever that means) people
> have said things
> like "power delivery seems more even with a torsen"
> and such like, but
> I'm not quite sure what that means - it could be
> consistent with what
> I said above :)
>
> --
> Ben Pearre          1990 200TQA
http://hebb.mit.edu/~ben


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